A very comprehensive tutorial was published by Francisco Rodriguez-Sanchez.
Hints on the usage of OpenStreetMap data with R - giswerk
In general (three osm apis)
OpenRouteService.org is in use at BKG
http://stackoverflow.com/questions/22387624/ggplot2-with-ggmap-odd-shaped-polygon-r
http://www.r-bloggers.com/visualising-crime-hotspots-in-england-and-wales-using-ggmap-2/
http://blogs.casa.ucl.ac.uk/category/r-spatial-tips/
http://blog.dominodatalab.com/geographic-visualization-with-rs-ggmaps/
Twitter and Maps
<img src=“https://aschinchon.files.wordpress.com/2015/02/states-in-two-words-v2.jpeg?w=906&h=453” width=“900x” height=“500x”>
library(streamR)
library(twitteR)
library(RCurl)
German videos on OSM
A step towards Bikemap as a real bike map
[http://www.toursprung.com/wp-content/uploads/2014/03/cycle-network-norther-germany-3.jpg]